The Grand Design

by Stephen Hawking

According to Feynman, a system has not just one history but every possible history.

model-dependent realism. It is based on the idea that our brains interpret the input from our sensory organs by making a model of the world.

According to M-theory, ours is not the only universe. Instead, M-theory predicts that a great many universes were created out of nothing. Their creation does not require the intervention of some supernatural being or god. Rather, these multiple universes arise naturally from physical law.